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12th Regiment Illinois Volunteer Infantry (3 Month)
Illinois flag
Active May 2, 1861 to August 1, 1861
Country United States
Allegiance Union
Branch Infantry

The 12th Regiment Illinois Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War.


The 12th Illinois Infantry was mustered into Federal service at Springfield, Illinois on May 2, 1861 for a three month enlistment.

The regiment remained in garrison at Cairo, Illinois and was mustered out on August 1, 1861.

Total strength and casualties[]

The regiment suffered 4 enlisted men who died of disease, for a total of 4 fatalities.[1]


  • Colonel John McArthur[2]

See also[]

  • List of Illinois Civil War Units
  • Illinois in the American Civil War


  1. The Civil War Archive website after Dyer, Frederick Henry. A Compendium of the War of the Rebellion. 3 vols. New York: Thomas Yoseloff, 1959.
  2. Illinois in the CivilWar website after Illinois Adjutant General's muster rolls